package com.bxs.scs.gateway.swagger;

import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

import java.util.ArrayList;
import java.util.List;

/**
 * <p>
 *
 * @link https://gitee.com/xiaoym/swagger-bootstrap-ui-demo/blob/master/knife4j-spring-cloud-gateway/service-doc/src/main/java/com/xiaominfo/swagger/service/doc/config/SwaggerResourceConfig.java
 * </p>
 * @author: Mr.Lu
 * @since: 2021/6/16 11:57
 */
@Slf4j
@Component
@Primary
@AllArgsConstructor
public class SwaggerResourceConfig implements SwaggerResourcesProvider {

    /**
     * Swagger2默认的url后缀
     */
    public static final String API_URI = "/v2/api-docs";

    /**
     * 网关路由
     */
    private final RouteLocator routeLocator;

    private final GatewayProperties gatewayProperties;

    @Override
    public List<SwaggerResource> get() {
        List<SwaggerResource> resources = new ArrayList<>();
        List<String> routes = new ArrayList<>();
        routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
        gatewayProperties.getRoutes().stream()
                .filter(routeDefinition -> routes.contains(routeDefinition.getId()))
                .forEach(routeDefinition -> {
                    routeDefinition.getPredicates().stream()
                            .filter(predicateDefinition -> "Path".equalsIgnoreCase(predicateDefinition.getName()))
                            .forEach(predicateDefinition -> resources.add(
                                    swaggerResource(
                                            routeDefinition.getId(),
                                            predicateDefinition.getArgs().get(NameUtils.GENERATED_NAME_PREFIX + "0").replace("/**", API_URI)
                                    )
                            ));
                });
        return resources;
    }

    private SwaggerResource swaggerResource(String name, String location) {
        log.info("name:{},location:{}", name, location);
        SwaggerResource swaggerResource = new SwaggerResource();
        swaggerResource.setName(name);
        swaggerResource.setLocation(location);
        swaggerResource.setSwaggerVersion("3.0");
        return swaggerResource;
    }
}
